Pho enters into an exclusive agreement with Qin to find suitable property for Qins enterprise. Later, Qin signs an exclusive agreement with Row for the same purpose. Neither agent knows about the other, and each expends reasonable efforts to perform. Qin buys a building through Pho. Most likely, Qin may be liable to Row for

a. none of the choices.

b. breach of the duty of cooperation.

c. negligence.

d. an accounting.